This episode has no set theme or story. It is unlocked upon beating Episode 3. In the Wii U version, if the player has Super Mario 3D World save data on their Wii U, they will automatically unlock the first chapter, Expedition to the Sprixie Kingdom. In the Nintendo 3DS and Nintendo Switch versions, tapping a Super Mario Odyssey series amiibo will automatically unlock the Super Mario Odyssey Kingdom chapter, which replaces the Expedition to the Sprixie Kingdom chapter from the Wii U version.